Heres some ideas i had for more yoyo modifiers!

Ender-use the power of a ender pearl to do many things! (removes some attack damage)

1. at base, adding a ender pearl will make the player teleport to the location of the end of the yoyo when pressing shift and auto reel it in
2. adding it to a sticky yoyo will also allow you to teleport on top of a block if the yoyo is stuck to the side of the block, will teleport the player to the location of the yoyo if the top is obstructed and unable to fit the player
3. adding it to a yoyo with collecting will make drops teleport directly into your inventory instead of being left on the yoyo

spring-yeee (removes some length from the yoyo)

1. causes yoyos to instantly retract and extend using shift and space and launching it with right click
2. mobs hit by the extention get dealt extra damage and a ton of knockback
3. retracting (shift) with a stuck sicky yoyo will launch the player with a LOT of force (like a slime sling from tinkers) (will unstick yoyo in prosess)
4. incompatible with ender on a yoyo with glue or sticky

extended- expands yoyos hitbox (increases weight)

1. if a mining modifier is added to yoyos, extends yoyo dig size
2. makes yoyo hitbox wider
3. extends shearing aoe and farming aoe

i hope you like these ideas!